A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER

Two-way quantum key distribution (QKD) protocols can provide positive secret key rates for considerably higher quantum bit error rates (QBER) than one-way protocols. However, when QBER is low, only modest key rate gains have been achieved. This is one of the major obstacles for using two-way protocols. In this paper we introduce a new two-way QKD protocol which is a step towards overcoming this shortcoming. Under the assumption that the eavesdropper can only perform individual symmetric quantum attacks, our protocol performs quantum key distribution with a secret key rate that is higher than the information theoretical bound limiting the performance of any one-way protocol. This holds true also for very low QBER values.

DOI

10.1109/ISIT44484.2020.9174522

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Lietzen, J, Vehkalahti, R & Tirkkonen, O 2020, A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER. in 2020 IEEE International Symposium on Information Theory, ISIT 2020 - Proceedings., 9174522, IEEE International Symposium on Information Theory, IEEE, pp. 1106-1111, IEEE International Symposium on Information Theory, Los Angeles, California, United States, 21/07/2020. https://doi.org/10.1109/ISIT44484.2020.9174522

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https://urn.fi/URN:NBN:fi:aalto-202009255553

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[article-cris] Sähkötekniikan korkeakoulu / ELEC

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A Two-way QKD Protocol Outperforming One-way Protocols at Low QBER

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